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Submerge is defined as to cover over, or to place or go under water. An example of to submerge is to put a toy boat completely under the bath water. transitive verb.
By definition, subsidence is the very slow to rapid sinking or settling of the land surface. Subsidence can be the result of natural causes. Some types of carbonate rock underlies topography containing numerous natural depressions, known as sinkholes. The topography is known as karst topography.